How to append script to head of page?

[bugboy]

I'm retrieving list data via ajax then appending a retrieved script 'str[x]' to the page. The script is suppose to create a new 'List' object with the retrieved data.

var head = document.getElementsByTagName("head")[0];
var script = document.createElement("script");
script.type="text/javascript";
script.appendChild(document.createTextNode(str[x])); 
head.appendChild(script);

Then i'm trying to call a method of the new object. It works if i place an alert before i call the method, but does not work when the alert is removed. At first i assumed the alert was creating a delay so all it needed was a timeout.. but adding that didn't work either.

Any ideas why i can access the object after an alert but not without it? I'm very confused..

Thanks!


Works:

function Person(lists){
	this.list=lists.split(",");
	get_list(lists); 
	alert('ok');//<----- works with this here
	listobj[this.list[0]].renderList('target1');
	listobj[this.list[1]].renderList('target2');
	}

Does not work:

function Person(lists){
	this.list=lists.split(",");
	get_list(lists); 
	listobj[this.list[0]].renderList('target1');
	listobj[this.list[1]].renderList('target2');
	}

Update: the only thing i can think of is that there is a problem creating a obj while creating an obj. Person is an object and get_lists creates several objects before during the Person object creation... but i guess that doesn't explain why adding the alert in there makes it suddenly work..

[gits]

get_list(lists);

does in fact an ajax-call?

[bugboy]

Yes this is an ajax call that appends the results to the head of the page.

[gits]

in that case the line

listobj[this.list[0]].renderList('target1');

cannot rely on the response ... since the response is reliably ready when the request is finished - your first assumption is correct - you would need to process the response in the request's final callback - the timeout might even have been to short ...

[bugboy]

Thanks gits, I set a 10 sec timeout which is much longer than i took to click an alert box and it still didn't work. I've move 'listobj' call to another point in the code and it now works.

Thanks for your help!